Doors (again)

The dark bit of an open door is now part of the doorframe graphic, and the doors opening and closing, as well as Udo's walking through the door, is done with alpha blending instead of the diffuse colour.

This means an open door can be a block of dark grey instead of black, which looks a bit better with the other graphics. There's a nice slightly washed-out feeling to all the colours in this game and the big solid black door holes were jarring a little.